There is a growing library of instructional videos available for viewing, including a mini training series. Each video is between 2 and 10 minutes long.
You can find a group of what's new here: Whats New In ArcGIS for AutoCAD 350 - YouTube and the first four of five training videos on ArcGIS for AutoCAD 350 here: ArcGIS for AutoCAD Training Series 350 - YouTube And a quick 2 minute overview here:What is ArcGIS for AutoCAD 350? (Short Clip) - YouTube
